No money:
Enter BBBBBBBBBBBB as a password.

$999,999:
Enter QQQQQQQQQQQQ as a password.

Extra lives:
Enter ZBBBBBBBLNTQ as a password to begin with 15 lives or NNNNNNNNNNNN as a password to begin with 7 lives.

Bonus level:
Enter MMMMMMQQQQQQ as a password. Do not touch any walls in this level.

Planet 1 mini-game:
Fly left as soon as your ship appears at Planet 1 and fly through the warp hole before it disappears.

Planet	Password
2	KLBLBKHBKLGB
3	KDBRNPBDRPHD
4	KLBMKBBGXHHB
5	KNDPBKKDGBNB
6	KNDHNBHBNWNB
7	LKDZKQHDTRNB
8	MDDBQBPDZZNB
9	MBGLNMKGHXNB
10	LQGGMQLHNDHH
11	DHGDQLNBTLNB
12	LMGZQBDPZLTG
13	KGHWGGBBGDHB
14	ZHHZQQQQNNNN
U	QQQQQQQQQQQQ
XX	BKKBKKHMBHMB